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Multi-piece connecting rod

Inactive Publication Date: 2010-10-14
WEIR SPM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]In an embodiment of the present invention, a reciprocating pump assembly has a pump located inside a housing. The pump has a crankshaft that rotates and a crosshead that is connected to a plunger via a pony rod. The plunger pumps fluid through cylinders in the pump when it is moved longitudinally within the cylinders. A connecting rod has a body and connects at one endpiece to the crankshaft and at another endpiece to the crosshead to thereby translate the crankshaft's rotational movement into linear movement of the crosshead and thereby energize the plunger.
[0007]In this embodiment, the endpiece that is connected to the crosshead is made of steel has an interference fit with the body of the connecting rod, which is made of a lighter material, preferably aluminum. In addition, fasteners may be used for added security. Alternatively, the fasteners may be omitted. This endpiece can be secured to the crosshead by a wrist pin that traverses a hole formed in the endpiece. The wrist pin allows the connecting rod's endpiece to pivot during pump operation. The crankshaft end piece may be of aluminum and integral with the body. This multi-piece design using a lighter aluminum metal results in a lighter connecting rod and thus reduces the weight of the pump. This can result in making transportation of the pump easier and less costly.

Problems solved by technology

As such, the connecting rod is heavy and adds to the overall pump weight, which can make the transportation of reciprocating pumps more difficult.

Method used

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Embodiment Construction

[0015]Referring to FIGS. 1 and 2, reciprocating pump assembly or pump 12 includes a crankshaft housing 13 that comprises a majority of the outer surface of reciprocating pump 12. Stay rods 15 attach to a side of crankshaft housing 13 and extend to a set of cylinders 17. Each cylinder 17 communicates with a fluid inlet 19 and a fluid outlet 21. As shown in FIGS. 1 and 2, a suction cover plate 22 connects to an end of each cylinder 17 opposite the crankshaft housing 13. Pump 12 is can be free-standing on the ground, can be mounted to a trailer that can be towed between operational sites, or mounted to a skid such as for offshore operations.

[0016]Referring to FIG. 2, a portion of reciprocating pump 12 housed within crankshaft housing 13 is shown. Crankshaft housing 13 houses a crankshaft 25, which is typically mechanically connected to a motor (not shown). The motor rotates crankshaft 25 in order to drive reciprocating pump 12 (FIG. 1). In one embodiment, crankshaft 25 is cammed so tha...

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Abstract

A reciprocating pump assembly having a pump within a housing. The pump having a crankshaft that rotates and a crosshead that is connected to a plunger via a pony rod. The plunger pumps fluid through cylinders in the pump. A connecting rod connects at one end to the crankshaft and at another end to the crosshead to translate the crankshaft's rotational movement into linear movement of the crosshead and thereby the plunger. The connecting rod is fabricated from multiple pieces, with the body of the connecting rod fabricated out of light weight aluminum and the end connected to the crosshead fabricated out of steel. The steel end of the connecting rod can withstand the stress at the crosshead. The lighter weight of the connecting rod lightens the weight of the pump and its transportation is easier and less costly.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to provisional application 61 / 143,289 filed Jan. 8, 2009.FIELD OF THE INVENTION[0002]This invention relates in general to connecting rods used in reciprocating pump crankshafts, and, in particular, to a multi-piece connecting rod fabricated out of steel and a lighter weight material to lighten its weight.BACKGROUND OF THE INVENTION[0003]Connecting rods are used in various kinds of pumps used in oilfield operations. A connecting rod can be used, for example, in a reciprocating pump. The reciprocating pump can be used to pump fluid such as chemicals, cement, or other media into a well. Reciprocating pumps typically increase the pressure within a cylinder by reciprocating a plunger longitudinally within the cylinder. The connecting rod typically has a body and two ends. One end bolts to the crank shaft and the other end pivotally secures to a crosshead. The crosshead strokes longitudinally within a crosshead h...

Claims

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Application Information

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IPC IPC(8): F04B53/14F16C7/02
CPCF04B53/144Y10T74/2142F16C7/023F05C2201/021
Inventor KUGELEV, VLADIMIRMATZNER, MARK D.
Owner WEIR SPM
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